SCCA CAM-C Thread

[mavisky]

Finally made it out to my first full event of the year last weekend on the new MCS coilovers. These were picked up secondhand from a friend who only does laps at Road Atlanta on Pirelli slicks. They came with the MMR GT4 spring rates which are 700F and 900R. I currently have this setup paired with Steeda competition swaybars set to full soft. Tires are Yokohamas that are a little over a year old and down to their wear bars in the middle grooves. Ended up 2nd fastest in the morning heat even though I coned away 4 of my 6 runs. My fastest run of the day was actually with a 250lb passenger in the car. As the course rubbered in and the pros got on course for the later heats I fell back considerably to top 25th overall on raw and 19th on PAX. Had I not clipped a cone with my passenger we would have been 20th overall and 15th in PAX

Not bad for a first full shakedown of the car. Spring rates still feel like a lot, but my car is also still full weight so it could probably use a little more than what some of you guys are using on your cars that are much closer to class minimum weight. Going to pull some toe-out of the front as the turn in is almost too quick and then going to take a few clicks out of compression and rebound for the next event to see if we can't get a little extra grip before it's time for new tires.

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[kz]

Some observations of people on Vitours - STL Shootout this weekend, cold (50-60F) / damp / rainy conditions.

They were pretty terrible until (and if) they could get some heat in them (which on a low grip surface isn't easy). For a 3 runs, it basically gives you one (last) run that is maybe going to be competitive and IMO for conditions like this you need a set of Yoks / Stones (and if Vitours aren't substantially faster than either, why buy them ?)

(also wonder how they're going to work out with 145% tariffs but maybe they have a workaround or something - or their margin right now is so high that they can keep the price intact giving some of it up).

 

[mavisky]

So we all know that the Yok's are probably the fastest things out there with the Stones being a very close 2nd most of the time when all things are equal.

With us GT350 guys being stuck on the 19's though we're limited to only a 295 Yokohama. I'm sure it's the fastest 295 out there, but given the new compound on the RT660+ I wonder if a 315 RT600+ is faster than a 295 A052?

 

[Dana Pants]

So we all know that the Yok's are probably the fastest things out there with the Stones being a very close 2nd most of the time when all things are equal.

With us GT350 guys being stuck on the 19's though we're limited to only a 295 Yokohama. I'm sure it's the fastest 295 out there, but given the new compound on the RT660+ I wonder if a 315 RT600+ is faster than a 295 A052?

I’ll take 295 yoks over 315 660+ any day. 295 is all I run anyway and my season has so-far been: 1st pax, 2nd pax, and maybe FTD at the novice school, but I didn’t interrogate my favorite GT4 driver for her fastest time.

One of my friends abandoned spec Miata 660 class for Vitour and everything got way better for his speed and enjoyment. At least as a dry tire. Therefore if yoko beats vitour and vitour beats 660, then 660+ loses unless this is rock-paper-scissors logic.

Edit: I wasn’t precise in my initial post. I understand 660 made updates, but without a massive compound change it won’t matter IMO. The 660 is passionately hated in NER drivers.

 

[kz]

So we all know that the Yok's are probably the fastest things out there with the Stones being a very close 2nd most of the time when all things are equal.

With us GT350 guys being stuck on the 19's though we're limited to only a 295 Yokohama. I'm sure it's the fastest 295 out there, but given the new compound on the RT660+ I wonder if a 315 RT600+ is faster than a 295 A052?

Interesting you mentioned this - winner at StL was on RT660+ in a (I think) F Street car. He is very very quick in everything on any tire so it isn't exactly a great data point but shows it can be made to work.

 

[WItoTX]

The 660 is a great tire for the first 5-6 heat cycles, and with our heavy ass cars, the stiffer sidewall just feels better. But after 6 heat cycles they are crap, with way too much tread left.

325/30/19 CRS are the answer for 19" wheels.

 

[Gearz]

Mike has put his car in BST with 11" square wheels and 315 660+s. He has nice suspension and a better CAI, maybe a tune. I'll check with him at Spring Nats to see how they're holding up. By then he'll have a few more heat cycles in them. I share the same concern about them cycling out but they're working great for him out of the box.

Greer was on BStones and went faster than all CAM classes in his FS spec Camaro, but he's an exceptional driver (not that Leeder isn't). I was on RE71RSs and it took about 10-15 seconds for them to get up to temp on that surface.

 

[NightmareMoon]

Finally made it out to my first full event of the year last weekend on the new MCS coilovers. These were picked up secondhand from a friend who only does laps at Road Atlanta on Pirelli slicks. They came with the MMR GT4 spring rates which are 700F and 900R. I currently have this setup paired with Steeda competition swaybars set to full soft. Tires are Yokohamas that are a little over a year old and down to their wear bars in the middle grooves. Ended up 2nd fastest in the morning heat even though I coned away 4 of my 6 runs. My fastest run of the day was actually with a 250lb passenger in the car. As the course rubbered in and the pros got on course for the later heats I fell back considerably to top 25th overall on raw and 19th on PAX. Had I not clipped a cone with my passenger we would have been 20th overall and 15th in PAX

Not bad for a first full shakedown of the car. Spring rates still feel like a lot, but my car is also still full weight so it could probably use a little more than what some of you guys are using on your cars that are much closer to class minimum weight. Going to pull some toe-out of the front as the turn in is almost too quick and then going to take a few clicks out of compression and rebound for the next event to see if we can't get a little extra grip before it's time for new tires.

Good deal on the MCS I hope!

Now you can play with spring rates to your heart's content1

 

[mavisky]

The 660 is a great tire for the first 5-6 heat cycles, and with our heavy ass cars, the stiffer sidewall just feels better. But after 6 heat cycles they are crap, with way too much tread left.

325/30/19 CRS are the answer for 19" wheels.

I've looked at those but the MCS upgrade took a sizeable chunk out od the racing fund this year and I'm still working with 19x11 wheels which doesn't feel like enough for a 325. Im basically between the 305 Stones or the 315 660+ until I find a wider set of wheels.

 

[WItoTX]

305 Stone all day. I was brutal to mine and they just asked for more

 

[webspoke]

305 Stone all day. I was brutal to mine and they just asked for more

This - it is a noticeably wider and faster tire than the 660+ even. 305 stone is almost as big as a 325 CRS, so you are not giving up anything. And works at the track as well as being great for autox.

To Kyle's original 295 vs 315 question, a 295 A052 is faster on my car than a 325 vitour. Only a 305 stone or a 325 CRS has a shot of being faster than an A052 on cars our size.

 

[Dallas J]

We've been struggling with the 305 Vitours on the Tesla with getting them up to to temp which kills the confidence pushing them since grip is changing each run. At full temp they seem to work well but its a lot of work to get there.

I'll be sticking with 315 A052s for the Mustang and Evo. Especially coming from PNW where temps and wetness are always a concern.

On the Tesla, we'll either go to 315 A052s or 305 RE71rs. The 295 RE71rs we had last year seem to have been slightly better than the 305 Vitours, at least in our early season tests so far. Though that early season still has 2 pros, 1 local, 1 Tour.

 

[Turbeau]

So we all know that the Yok's are probably the fastest things out there with the Stones being a very close 2nd most of the time when all things are equal.

With us GT350 guys being stuck on the 19's though we're limited to only a 295 Yokohama. I'm sure it's the fastest 295 out there, but given the new compound on the RT660+ I wonder if a 315 RT600+ is faster than a 295 A052?

You can get the Stones in 305.

Bridgestone Potenza RE-71RS | 305/30R19 | Tire Rack

 

[mavisky]

You can get the Stones in 305.

Bridgestone Potenza RE-71RS | 305/30R19 | Tire Rack

That's the new plan

 

[Dana Pants]

I took top pax at a local event yesterday on RE-71RS tires that reached 149 runs by the end of the day. I expected to be uncompetitive on these relatively burnt-out tires, but that was not the case. Looking at the tires in grid, I am again given ammunition that Vitour is harmful to driver competitiveness. It was an overcast dry day with a high of 80 degrees.

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